Plug for a hammer union



FIG. 1 is a top perspective view of another embodiment of a plug for a hammer union showing my new design;

FIG. 2 is a bottom perspective view of the design of FIG. 1;

FIG. 3 is a top view of the design of FIG. 1;

FIG. 4 is a bottom view of the design of FIG. 1;

FIG. 5 is a side view of the design of FIG. 1;

FIG. 6 is another side view of the design of FIG. 1;

FIG. 7 is another side view of the design of FIG. 1; and,

FIG. 8 is another side view of the design of FIG. 1. 

CLAIM The ornamental design for a plug for a hammer union, as shown and described. 